*{
    margin: 0;
    padding: 0;
}
.box{
    width: 900px;
    height: 600px;
    border: 5px solid #e1251b;
    margin-top: 50px;
    margin-left: 150px;
}
li{
    width: 300px;
    height: 300px;
    float: left;
}
img{
    width: 300px;
    height: 300px;
}